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If d denotes a decimal, is d>=0.5 ?

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If d denotes a decimal, is d>=0.5 ? [#permalink] New post 15 Oct 2012, 03:49
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If d denotes a decimal, is d\geq{0.5} ?

(1) When d is rounded to the nearest tenth, the result is 0.5.
(2) When d is rounded to the nearest integer, the result is 1.

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Re: If d denotes a decimal, is d>= ? [#permalink] New post 15 Oct 2012, 03:49
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SOLUTION

If d denotes a decimal, is d\geq{0.5} ?

(1) When d is rounded to the nearest tenth, the result is 0.5. This statement implies that 0.45\leq{d}<0.55. Not sufficient.

(2) When d is rounded to the nearest integer, the result is 1. d cannot be less than 0.5 because in this case 1 won't be the nearest integer. Sufficient.

Answer: B.

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Re: If d denotes a decimal, is d>= ? [#permalink] New post 15 Oct 2012, 04:24
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1) d can be any number between 0.45 to .54 --- >Insufficient
2) d can be any number greater than or equal to 0.5-->Sufficient
Answer B

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Re: If d denotes a decimal, is d>=0.5 ? [#permalink] New post 16 Oct 2012, 01:38
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These one are always tricky for me

We have to know id d is < = or >= 0,5

1) if the number is 0,45 to 0,54 we have the decimal that cuold be 4 or 5 (0,4 or 0,5)

2) if the numbe must be 1 the number ranging from 0,5 to 0,9 but always the decimal will be >= 0,5

B is the answer

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Re: If d denotes a decimal, is d>=0.5 ? [#permalink] New post 16 Oct 2012, 05:14
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so statement 1 (1) When d is rounded to the nearest tenth, the result is 0.5.

so if we pick d=0.48 then in this case the answer to is d>=0.5 is NO

but if we pick d=0.53 then in this case it is YES

2 situations YES / NO ambiguity hence insufficient


When d is rounded to the nearest integer, the result is 1.

so for example if d=0.2 then the decimal would be rounded to nearest integer which is 0

but we have been given that it is rounded to 1 so the range is 0.5 to 1.4 in all of those cases it is rounded to 1 hence B is sufficient

Answer is B

Last edited by nelz007 on 16 Oct 2012, 19:03, edited 1 time in total.
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Re: If d denotes a decimal, is d>=0.5 ? [#permalink] New post 16 Oct 2012, 05:25
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Statement 1:
round(d,0.1) = 0.5
=>
0.45<=d<=0.54
Not suff as d can have values less than 0.5 as well as greater than 0.5

Statement 2:
round(d,1) =1
=>
0.5 <=d<=1.49
for any value of d here, it is sufficient to answer.

Ans B
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If d denotes a decimal, is d\geq{0.5} ?

(1) When d is rounded to the nearest tenth, the result is 0.5.
(2) When d is rounded to the nearest integer, the result is 1.

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Page: 280
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Re: If d denotes a decimal, is d>=0.5 ? [#permalink] New post 16 Oct 2012, 11:16
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Its B.. was confused .49 wud be included in option or not...then i thought no..because .51 to1.49 wud b nearest integer 1..

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Re: If d denotes a decimal, is d>=0.5 ? [#permalink] New post 19 Oct 2012, 04:30
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SOLUTION

If d denotes a decimal, is d\geq{0.5} ?

(1) When d is rounded to the nearest tenth, the result is 0.5. This statement implies that 0.45\leq{d}<0.55. Not sufficient.

(2) When d is rounded to the nearest integer, the result is 1. d cannot be less than 0.5 because in this case 1 won't be the nearest integer. Sufficient.

Answer: B.

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COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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Re: If d denotes a decimal, is d>=0.5 ? [#permalink] New post 15 Jul 2014, 03:27
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Re: If d denotes a decimal, is d>=0.5 ?   [#permalink] 15 Jul 2014, 03:27
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